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3. 发明专利

JPS62200255A GAS CONCENTRATION MEASURING APPARATUS 失效
公开(公告)号：JPS62200255A
公开(公告)日：1987-09-03
申请号：JP4275486
申请日：1986-02-27
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： TANAKA HIROKI , SASAKI KOICHI , NAKAMURA FUMITO , TAKAHARA KUNIAKI , NAKAYAMA NORIO
IPC分类号： G01N27/04 , G01N27/18
摘要： PURPOSE:To form a highly accurate concentration measuring apparatus with an excellent continuous measuring performance which eliminates effect of a specified coexistent gas, by jointly using a specified coexistent gas detector free from effects of a gas to be measured and other coexistent gases with a detector for a gas to be measured as affected by the specified coexistent gas. CONSTITUTION:This apparatus is made up of a detector for a gas to be measured, a specified coexistent gas detector free from effects of a gas being measured and other coexistent gases, an amplifier which is adapted to calculate the amount enough to cause an apparent increase in the concentration of the gas being measured based on a concentration signal from the specified coexistent gas detector as correction signal and a subtract or 9 which receives and subtracts the correction signal from the concentration signal of the gas being measured. For example, an oxygen concentration signal x inputted into an arithmetic unit 9 is branched into and one thereof is converted into a hydrogen concentration correction signal DELTAy and furthermore, the hydrogen concentration signal DELTAy corresponding to the oxygen concentration signal x is subtracted with a subtracting element 35 from a hydrogen concentration y' inputted into the subtractor 9. A true hydrogen concentration signal y is outputted to be shown on a hydrogen concentration indicator 10.

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